1 1C genome size and n chromosome number for bryophytes.2 Position refers to that of most chromosomes in the species and can be either interstitial (i), (peri-)centromeric (c) and (sub-)terminal or satellite (t).3 35S=45S=18S-5.8S-26S rDNA

What’s new?

The second release of the plant rDNA database (Release 2.0, June 2013) comes two and a half years after the database was launched (Release 1.0, January 2011). In such a short period of time, the amount of publications and accessions with data available has almost doubled. The total number of research papers consulted exceeds 600!

Up to Release 1.0, the database covered information only from papers that included both the 5S and the 18S-5.8S-26S rDNA loci. From Release 2.0 it also includes data from papers on either one or the other rDNA.

We have also reviewed all publications to provide information about presence of secondary constrictions which are the hallmark of transcription activity of residing rRNA genes (i.e. active NORs).

New information on telomere composition

Data on telomere motives has been extracted from the same source publication of rDNA-FISH in the cases where this information was included. Additionally, other general sources on telomere composition have been used. Some assumptions have been made to organize the data. When a given telomere sequence was confirmed for several species in a genus, this has been considered that any other species from the same genus would present the same telomere sequence. We also state that a given species may have “probably” or “possibly” a given telomere type when there is evidence at the family or order level, respectively. Where there is no evidence above the taxonomic level order the status is “unknown”. In few cases (particularly in species of order Asparagales) presence of more than one telomere signal may be due cross-hybridisation between telomere probes.

New and upgraded page tabs

New tabs:

Sequenced plant genomes: Information on plant species whose genome has been fully sequenced. The page allows browsing publications of plant genomes sequenced by family. Every species is linked with the corresponding publication presenting the sequenced genome.

Upgraded tabs:

Home page Revised introduction presenting the amount and the kind of information available in the database with graphics on the data increase from Release 3.0.

Links New interesting links have been included and outdated pages removed.

Publications The new research papers from Release 3.0 have been added with their links. Also, papers contributing information on telomere composition are listed with papers on rDNA.

Others...

The status of hybrid origin, either intervarietal, interspecific or intergeneric has been included.

The taxonomic category “order” has been added

Taxonomic classification has been updated according to the APG IV

Browsing tools have been tested for errors and enhanced

Mistaken or broken hyperlinks have been reviewed, updated or corrected